package com.thirtyparty.controller;

import com.google.code.kaptcha.Constants;
import com.google.code.kaptcha.Producer;
import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.servlet.ModelAndView;

import javax.annotation.Resource;
import javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.awt.image.BufferedImage;
import java.util.UUID;
import java.util.concurrent.TimeUnit;

/**
 * @Author Rookie-6688
 * @Description
 * @Create 2021-04-20 21:29
 */
@Controller
public class KaptchaImageController {

    @Resource
    private RedisTemplate stringRedisTemplate;

    @Autowired
    private static Logger logger = LoggerFactory.getLogger(KaptchaImageController.class);
    @Autowired
    private Producer captchaProducer;

    @RequestMapping("/getKaptchaImage")
    public ModelAndView getKaptchaImage(HttpServletRequest request, HttpServletResponse response, @RequestParam String id) throws Exception {
        // 对 id 进行处理，因为加入了时间所以传来的也携带了 date 属性，需要分隔，只取 date 前面部分
        if(id.contains("date")){
            // 页面刷新时不会携带，所以不需要切割
            id = id.substring(0,id.indexOf("date"));
        }

        HttpSession session = request.getSession();
        String code = (String) session.getAttribute(Constants.KAPTCHA_SESSION_KEY);
        logger.debug("******************验证码是: " + code + "******************");

        response.setDateHeader("Expires", 0);

        // Set standard HTTP/1.1 no-cache headers.
        response.setHeader("Cache-Control", "no-store, no-cache, must-revalidate");

        // Set IE extended HTTP/1.1 no-cache headers (use addHeader).
        response.addHeader("Cache-Control", "post-check=0, pre-check=0");

        // Set standard HTTP/1.0 no-cache header.
        response.setHeader("Pragma", "no-cache");

        // return a jpeg
        response.setContentType("image/jpeg");

        // create the text for the image
        String capText = captchaProducer.createText();

        // store the text in the session
        session.setAttribute(Constants.KAPTCHA_SESSION_KEY, capText);

        Object attribute = request.getSession().getAttribute(Constants.KAPTCHA_SESSION_KEY);
        System.out.println("object："+attribute);

        // create the image with the text
        BufferedImage bi = captchaProducer.createImage(capText);
        ServletOutputStream out = response.getOutputStream();

        // 存入 redis
        stringRedisTemplate.opsForValue().set(id,attribute,10, TimeUnit.MINUTES);
        // write the data out
        ImageIO.write(bi, "jpg", out);
        System.out.println(session.hashCode()+"--------------");
        try {
            out.flush();
        } finally {
            out.close();
        }
        return null;
    }
}
